New top story on Hacker News: Ask HN: Are people only smart til they talk about something you are specialized?

Ask HN: Are people only smart til they talk about something you are specialized?
8 by theyx | 7 comments on Hacker News.
Hey, all. Have you ever noticed people who you regarded as smart/intelligent, show themselves not to be that smart when they talk about something you know a lot about? Say, you come to Hackernews/Reddit and usually see people on these sites as knowledgeable people. But when they talk about a topic you know very well, you realize they aren't that smart. And, if this happens to the topics you know a lot about, what about the other topics you don't know much about? Are they wrong about those too? So my question is: is there a name for this "effect", that you "lose trust" on someone you regarded as knowledgeable when they talked about something you know well?